SOUND  : HOW IT WORKS

Sound travels through the air as waves. The air vibrates as a result,
changing the distance between each air molecule. These molecular movements
of air reach your eardrum, and cause it to vibrate. When your eardrum
vibrates, you hear the sound.

Analog electric audio signals are typically direct currents that vary in
strength. The quickly changing high and low voltages in an audio signal
correspond to the movement of air moecules  When the diaphragms of
microphones vibrate, they send current through the audio cable.
This current is your audio signal  A speaker does the same thing in
reverse. The current reaches the speaker, and the coils of wire in the
speaker turn it back actual movement.  This movement causes the air
surrounding the speaker to vibrate. This vibration results in the sound
we hear. (Hence the poor sounding 'headphones as stealth microphones'
technique. The signal is usually far too low, so the sound is, while
binaural in principal, is usually terrible.)
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